Diaphragm-die for plastic molding



(N0 Model.)

J. H. MITCHELL.

DIAPHRAGM DIEPOR PLASTIC MOLDING. No.. 413,453. Patented 0pt. 22.1889.

UNITED STATES PATENT OFFICE.

JAMEs II. MITCHELL, or PHILADELPHIA, PENNSYLVANIA.

DIAPHRAGM-Dls FOR PLASTIC MoLDlNc.

SPECIFICATION forming part of Letters Patent No. 413,453, dated october 22, 1889.

Application filed December 10,1888. Serial Noi. 293,225. (No model.)

To Ir/ZZ whom t may concern:

Be it known that I, .I AMES H. MITCHELL, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Diaphragm-Dies for Plastic Molding, of which Y the following is a speciiication.

My invention relates especially to means and mechanism employed for molding plastic material of any kind, and has for its object the provision of a cheap and simple arrangement of die or dies whereby the material molded is kept from actual contact with the face of the die, while closely conforming thereto, and wherein all delicate clearingdevices are done away with and choking or clogging of the Inoving parts is obviated.

To'attain the desired end my invention consists, essentially, in the combination, with a cutting and molding die and means for op# erating the same, of an elastic diaphragm extending over the face of the die, all of which will be hereinafter first fully described, and then pointed out in the claims.

I have shown my improvement as applied to the cutterhead of a cake machine for bakersuse; but it is obvious that the invention may be employed with any-machine used for cutting and molding plastic material other than dough.

In the drawings, Figure lis a sectional elevation of a cutter-head wherewith my device is employed. Fig. 2 is a cross-sectional view showing the die before it is depressed, and Fig. 3 is a like view with the die depressed.

Fig. 4 shows a modified arrangement of diaphragm.

Like letters of reference indicate corre sponding parts. v

A is the main frame of the cutter-head. B

are the dies secured thereto and pro vided each with an airvent C.

D is a roller secured to a shaft E by means of a sctfscre'vs7 F, said shaft being journaled in the main frameA and made to draw there from and from roller D when the set=screw is removed.

G is a ratchet-wheel, and H a pawl, mounted upon an operatingarm I, to which a pitman J is pivoted.

K K are rollers mounted in the main frame A at each side of the dies.

L is a hopper mounted above roller D and arranged to contain flour. M is a diaphragm' or belt of thin elastic material, passing around the rollers D and K over the face of the dies B.

N is a portion of the bed of a machine, and

vby the dough, stretching and conforming to the coniiguration thereof, and the dough iilling the die in precisely the same manner as would be the case without the interposition of the diaphragm, and the edges of the die separating the Acake from the sheet of dough. As the die rises, the diaphragm contracts, expellingthe cake from the die and depositing it upon the carrying-belt. At each movement of the cutter-head the roller D is turned a portion of a revolution by means of the ratchet upon its shaft, coating the diaphragmbelt with the flour and presenting a new surface beneath the die. It will thus be seen that the cutter=-head and dies may be greatly simpliiied in construction, and therefore reduced in cost. The face of the die and the cutter-head itself are protected from direct contact with the material molded, and chok ing of the parts or sticking of the material thereto obviated, while atV the same time the molding is fully and accurately accomplished.i There are many materials molded in such a" state that the use of flour, or its equivalent, on the face of the diaphragm may be dispensed with, and in such cases a stationary elastic diaphragm may be used, such as is illustrated in Fig. et. v

Having now fully described my invention, what I claim as new isl. The combination, with a reciprocating IOO and a Het unbroken support for said lnetel Signed at New Yoik,'in the county of New rial, Substantially as shown and described. York and State of New York, this 8th day of 1o 2. The combination, with a cutting and December, A. D. 1888.

molding die, of a movable elastic expelling- 5 diaphragm passing over the face of the die JAMES H. MITCHELL.

and a flat unbroken table or support beneath Witnesses: the face of the die, substantially as shown A. M. PIERCE,

and described. THEO. L. POPP. 

